CORNELL UNIVERSITY Center for Radiophysics and 5} space Research SPACE SCIENCES BUILDING Ithaca, New York 14853 Telephone (607) 256-4971 Laboratory for Planetary Studies oN CEELLER © Novia tore. 2 , | “s LICE or THe PRESS f November 10, 1978 — Dr. Joshua Lederberg Office of the President Rockefeller University 1230 York Avenue New York, N.Y. 10021 Dear Josh: osed is the manuscrip titled "Evaporation of Ice in Planetary Atmospheres: Ice-Choked River Mars." I would be very grateful for any comments which you might have on those aspects of it close to your interests. : With all good wishes, Cordially, OS segeny) L Carl Sagan CS/ss1 enc.